Whether you're reenacting the French Revolution or screaming "Off with her head!" a la the Queen of Hearts, this DIY guillotine is the way to go. And based on the video, it looks easier to assemble than some shelving units.
Sean Gunn on Working With His Brother
The Sokkomb guillotine is a "new low-cost product designed specifically for all those citizens who are so interested in Do-It-Yourself Justice." Yeah, it's just a mock up, but the video itself is pretty much a DIY guide without the measurements. (Does anyone have thoughts on how thick of a blade that appears to be?)